Bag sealing mechanism



May 23, 1933. P. NAEHER 1,910,037

BAG 'SELING MECHANISM Filed Sept. 8, 1951 2 Sheets-Sheet 1 May 23, 1933.p, NAEHER 1,910,037

BAG SEALING MECHANISH Filed Sept. 8, 1951 2 Sheets-Sheet 2 'Patented May2.3, 1933 UNITED STATES' PATENT oFFlcE PAUL NAEHEB, '0F CHICAGO,ILLINOIS, ASSIGNOR '.lO B. '.l. GUMP CO., OF CHICAGO, ILLINOIS, ACORPORATION OF ILLINOIS :BAG sEALING MECHANISM Application :BledSeptember 8, 1931. Serial No. 561,623.

rllhis invention relates to tape applying mechanism for a bag sealingmachine and primarily concerns itself with means for shaping andretaining the sides of the bag while the tape is being applied over thetop and down the ends of the bag.

It has been found in practice that if the sides of the bag are notproperly supported or retained from bulging outwardlv when the tape isbeing rolled over the top and over the ends of the bag, there is more orless kinking or distortion at the corners of the bag. lt is an obj ectof this invention to overcome this objection in the provision of sideplates that move down in advance of the tape applying rollers forholding the sides of the bag against bulging while the rollers apply thetape.

The invention comprises the novel structure and combination of partshereinafter described and more particularly set out and defined in theappended claims.

In the accompanying drawings which'illustrate a preferred form of thisinvent1on and in which similar reference numerals refer to similarfeatures in the different views:

Figure 1 is a sectional view through a bag closing machine illustratingthe tape applying mechanism in elevation.

Figure 2 is an enlarged sectional view taken upon the line II-II ofFigure 1 looking in the direction of the arrows and showing parts inelevation.

Figure 3 is a fragmentary and elevational view of the machine upon anenlarged scale.

Figure 4 is a fragmentary sectional view taken upon the line IV-IV ofFigure 1 looking in the direction of the arrow and showin# parts inelevation.

In order to illustrateA this invention, parts of the bag closing andsealing machine have been illustrated. The bag to be-folded and sealedis adapted to be conveyed along a longitudinally extending platform 1having side rails 2. The platform is positioned a short distance belowthe table or bench 3 which supports the operating mechanism. A pair ofvertical rods or standards 4 are supported upon the bench 3. A block 5is mounted upon the standards 4 for reciprocating movement. This block 5carries a lateral bar 0r support 6 upon which a pair of side plates 7are adjustably mounted. These side plates have upper angle clips 8 whichare attached to the support 6 by means of bolts 9 which pass throughslots l() in the bar 6 whereby said plates may be laterally adjusted fordifferent sizes of bags. Between the plates 7 there is a top plate 11which is adapted for pressing against the top of the bag. Above theblock 5 which in reality constitutes a cross-head, there is a-secondcross-head 12 which is slidably mounted upon the standards 4. Thecross-head 12 is normally urged upwardly against an adjustable stop 13by means of coil springs 14. A pair of spaced shafts 15 are carried bythe cross-head 12 for rotatable movement and each of the shafts 15carries an arm 16 which has a tape applying roller 17 journaled thereon.These arms are normally pressed against the ends of the bag by means ofa coil spring 18 which connects the two arms as shown in Figure 4.

The different crossheads are adapted to be reciprocated downwardly bythe following mechanism:

A shaft 19 which is suitably journaled in the machine constitutes thedriving shaft and this shaft is equipped with a segmental 'gear 2()having a cam ,21 attached to its rear face. The segmental gear 20 isadapted for engaging a rack 22 attached to the cross-head 12 and the cam21 is adapted to engage a stud or roller 23 attached to the cross-head5. Consequently, when the gear 20 is rotated the two cross-heads will besimultaneously lowered so that the plates 7 Will engage the sides of thebag and shape the same and retain it from bulging outwardly while therollers 17 press the tape against the ends of the bag. As the cross-head6 descends, the compression plate 11 will apply the tape upon the top ofthe bag.

In the drawings, there is shown a bag B having a piece of tape T appliedover the top thereof by the compression plate 11 and the rollers 17. Itwill be appreciated that when these rollers 17 are yieldjngly compressedagainst the ends of the bag, they ap ly considerable pressure whichtends to or distort the corners of the bagwhich are represented by thereference numeral 24. However, by the use ofthe side plates 7 whichretain 'the side walls ofthe bag from spreading or bulging outwardly orbeing distorted, the distortion 'of the ba at the corners 24 iseliminated and avoide After a piece of tap'e has been applied t the` top'of the bag, the cam 21 will pass the roller 23 and the teeth and gears20 will pass out .of engagement` with the -rack 22, the springs 14will-then elevate the cross-head 12, while the cross-head is adapted tobe elevated by a coil spring-25 mounted upon one of the standards 4beneath said cross-head as shown in Figure 4.

I am aware that many changes may be j made and numerous details ofconstruction may be varied through a wide ran e with-- out departingfrom the principles o this invention, and I, therefore, do not purposelimiting the patent granted hereon otherwise than necessitated by theprior art.

I claim as my invention:

-1. In a bag sealing mechanism, a reciprocating member having acompression plate for engaging the top of the bag and having spacedlates for engaging the sides of the bag an a second reciprocating memberhav-1 ing means for yieldingly engaging the ends of the bag. .p n

' 2. -In a bag sealing mechanism, a reciproi cating'crosshead having alaterally extending bar, a--pair of spaced plates adjustably carried bysaid bar, a compression plate mounted on said bar between said plates, asecond reciprocatingcrosshead, spaced shafts carried by said crosshead,arms yieldingly mounted on and carried by said shafts, and'rollerscarried by said armsfor engaging the ends of a bag.

3.` In a bag closing machine, a reciprocating member adapted forengaging the top and sides of the bag, a reciprocating member -havingmeans for engaging the ends of the bag and means for simultaneouslyoperating said reciprocating members.

' 4. In'a bag closing machine, a pair ci swingable arms, rollers carriedthereby, means for supportin said arms for reciprocable movement, yieding means connecting said arms, and a reciprocable member having acompression plate and a'pair of spaced plates extending transversely'tothe axes of said rolls.

` 5. In a bag closing machine, a reciprocable -member having yieldingrollers for apl plying tape to the ends of the bag, and means movable inadvance of said 'rollers for engaging the sides of the bag.

' 6; In a bag sealing machine, a reciprocating member embod'ylng acompression plate for engaging the top of the bag, and a air ofspacedplates for engaging the sides o the bag, a second reciprocable member,arms pivoted to said second member, rollers carried by said arm forengaging the ends of the bag and yielding means connecting said arms.

7. In a bag sealing machine, the combination with a movable means for aplying a piece of tape to the top of the bag, ci) a member movable inadvance of said means for engaging the sides of said bag and embody-PAUL NAEHER. l

